add colorization pipeline example
add colorization pipeline example

radiantbluetechnologies/PDAL,boundlessgeo/PDAL,radiantbluetechnologies/PDAL,verma/PDAL,boundlessgeo/PDAL,lucadelu/PDAL,jwomeara/PDAL,radiantbluetechnologies/PDAL,jwomeara/PDAL,radiantbluetechnologies/PDAL,verma/PDAL,Sciumo/PDAL,DougFirErickson/PDAL,Sciumo/PDAL,lucadelu/PDAL,mtCarto/PDAL,lucadelu/PDAL,mpgerlek/PDAL-old,mtCarto/PDAL,Sciumo/PDAL,verma/PDAL,jwomeara/PDAL,jwomeara/PDAL,mpgerlek/PDAL-old,lucadelu/PDAL,mtCarto/PDAL,mtCarto/PDAL,verma/PDAL,mpgerlek/PDAL-old,DougFirErickson/PDAL,Sciumo/PDAL,verma/PDAL,mpgerlek/PDAL-old,DougFirErickson/PDAL,verma/PDAL,boundlessgeo/PDAL,boundlessgeo/PDAL,verma/PDAL,DougFirErickson/PDAL